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We naturally watch new sales because that is the number moving in front of us.
New contracts. New customers. New revenue.
But the net revenue retention formula asks a different question, and I think it is one of the most useful questions an owner can ask:
What happened to the customers we already won?
Because sales can be up while the customer base underneath those sales is getting weaker.
If we stopped adding customers tomorrow, would the customers we already have make the business bigger next year?
Or smaller?
That tells us something very different about the business we are building.
The Net Revenue Retention Formula Shows What Happens After the Sale
Net revenue retention, or NRR, measures what happens to revenue from the same group of customers over a period of time.
Once we win a customer, it is easy to move our attention to the next one. The net revenue retention formula forces us to stay with that original group and see what actually happened after the sale.
Some customers leave.
Some stay but spend less.
Some stay and spend more.
That gives us the three things NRR is really tracking: churn, contraction, and expansion.
New customers do not belong in the calculation.
That is the point.
If we mix new sales into the number, we lose the ability to see whether the customers we already paid to acquire are becoming more valuable or less valuable over time.
How the Net Revenue Retention Formula Actually Works
The basic process is pretty simple:
- Start with the revenue from the same group of customers.
- Subtract revenue lost through churn and contraction.
- Add revenue gained through expansion.
- Compare the ending revenue with what that group produced at the beginning.
The math is useful.
But what the number tells us is more important.
What 105% NRR Actually Looks Like
Take a simple example.
Say we start January with 40 clients averaging $100,000 each. By December, after accounting for the clients who left and the additional revenue from the ones who stayed, that same original group is producing the equivalent of $105,000 per client.
That gives us 105% NRR.
This is the part we tend to miss because we usually mix this revenue together with everything new we sold during the year.
At 105%, the customers already on the books are producing more revenue than they did before we add a single new customer.
That is a very different growth engine.
And Here Is What 95% NRR Looks Like
Now take the same 40 clients.
Two leave.
The remaining 38 stay flat.
NRR drops to 95%.
The company could still report revenue growth if the sales team brings in enough new business. We could look at total revenue at the end of the year and feel pretty good about what happened.
Meanwhile, the original customer base is shrinking.
The P&L can say growth while the customer base tells us something very different.
New Sales Can Hide a Retention Problem
We tend to treat a dollar of new revenue and a dollar of retained or expanded revenue like they tell us the same thing.
They do not.
A business can grow because the sales team keeps replacing whatever churn takes away. That is still growth, but it is not the same as a business where existing customers are producing more revenue on their own.
The net revenue retention formula separates those two realities.
Above 100% means the existing customer base is growing before new customers are counted.
That matters because new customer acquisition costs money. Expansion from customers we already have does not require us to go win that customer from scratch again.
How Much Are We Selling Just to Replace What We Lost?
A big sales year can look great.
But how much of that selling created new growth?
And how much simply got us back to where we started?
That is the question.
We can have a strong year on the sales side and still spend a surprising amount of that effort replacing revenue that disappeared.
A million dollars of new sales sounds like a million dollars of growth.
Sometimes it is.
Sometimes it is mostly replacement.
Above 100% Is Where Revenue Starts to Compound
This is where NRR starts to get interesting.
It is the commercial equivalent of compounding interest.
At 100%, the existing customer group stays flat. Above 100%, it gets larger. Below 100%, it gets smaller.
The important part is what happens when that repeats.
A business above 100% starts the next period with more revenue from customers it already acquired. Then the new sales stack on top.
Everyone wants more sales.
What we really want is for those sales to stack on top of something that stayed.
You Should Not Have to Rebuild Last Year’s Revenue Every January
Some companies start every year trying to refill what leaked out.
Others start the year with more existing revenue than they had before.
The second business still needs sales. Of course it does.
But new sales become additive instead of constantly restorative.
None of us wants the sales team spending the first half of the year rebuilding revenue we thought we already owned.
That is why the net revenue retention formula tells us more than whether customers are simply staying.
It tells us whether the base underneath the business is compounding.
What Is a Good Net Revenue Retention Rate?
There is not one NRR number that means the same thing in every business.
The business model matters.
For SaaS, 110% Is Elite
For SaaS businesses, NRR above 110% is considered a hallmark of elite commercial performance.
That means the existing customer base is producing meaningful growth before new customer acquisition is added.
Service Businesses Play a Different Game
For service businesses, consistently staying above 95% NRR while continuing to acquire new customers can create a strong compounding engine.
The important word is combined.
Retention does not remove the need to acquire customers.
Acquisition does not excuse weak retention.
Buyers Are Looking at the Revenue Underneath the Revenue
We tend to look at revenue as the outcome.
A buyer is trying to understand what had to keep happening underneath it.
If customers remain durable and expand, the business is less dependent on constantly finding replacement revenue.
That makes the engine underneath the company more attractive to investors.
Two businesses can show similar revenue growth and still create very different levels of risk.
That is why the net revenue retention formula matters when we start thinking like owner-investors instead of only operators.
Revenue Growth and Revenue Quality Are Not the Same Thing
Revenue tells us how much the company sold.
NRR tells us what happened after the customer was acquired.
We say we want growth. But if every new dollar first has to replace an old one, we need to be more precise about what kind of growth we created.
If we want to build something another investor would actually want to own, the quality of that revenue matters right alongside the amount of it.
One Question Tells You Whether Revenue Is Compounding or Leaking
A lot of us already have this information somewhere.
We just have not separated it this way.
So start with one question:
What happened to the revenue from the customers we already had?
Look at the customers who left. Look at the ones who spent less. Look at the ones who expanded.
Then run the net revenue retention formula.
If we cannot answer that question, topline growth is telling us only part of the story.
We spend a lot of time asking how to sell more.
Fair question.
But there is another one that matters just as much if we are trying to build something another investor would actually want to own:
What happened to the customers we already won?
If they leave, shrink, and have to be replaced every year, we may have revenue growth. But we do not have much compounding.
If they stay and grow, something different starts happening.
Next year’s sales do not have to rebuild this year’s business.
They get to build on top of it.
And that is when revenue starts behaving less like income we have to keep recreating and more like an asset that gets stronger as we own it.
Justin D Maxwell provides family office and investment bank services to the lower midmarket to founders who want 8 or 9 figure net worths. You can learn more here: www.justindmaxwell.com or take our free assessment here: https://fielding.global/articles/diagnostic.html